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प्रश्न
The world's known coal reserves are expected to last for about:
(a) 200 years
(b) 400 years
(c) 500 years
(d) 100 years
उत्तर
200 years
The world's known coal reserves are expected to last for about 200 years.
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संबंधित प्रश्न
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Which of the following is not a renewable source of energy?
(a) wind
(b) flowing water
(c) fossil fuels
(d) fuel wood
LPG consists mainly of:
(a) butane
(b) ethane
(c) butanone
(d) methane
Fossil fuels are energy rich compounds of an element X which were originally made by the plants with help of sun's energy.
Name the element X.
What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?
State whether the following statement is true or false:
Tidal energy is one of the forms in which solar energy manifests itself in oceans.
What is biomass? Give three examples of biomass.
Compare and contrast biomass and hydroelectricity as sources of energy.
The source of energy of the sun is:
(a) conversion of hydrogen gas into helium
(b) conversion of carbon fuel into carbon dioxide
(c) burning of hydrogen gas present in the sun
(d) disintegration of uranium into barium and krypton
Explain why is it no wise to regard wood as a renewable sources of energy.
